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The title mol­ecule, C20H23NO2S, adopts a twisted conformation in which the two aromatic rings connected to the central piperidine ring are orientated trans to each other. An intra­molecular C—H...S contact occurs. In the crystal, C—H...π and C—H...O inter­actions act to stabilize the structure in three dimensions.

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The title compound, C13H17NO3, adopts a conformation in which the aromatic ring and the mean plane of the piperidine ring are almost perpendicular to each other [dihedral angle = 79.25 (6)°]. The presence of the carbonyl group alters the conformation of the piperidine ring from a chair to a twisted half-chair conformation. In the crystal, pairs of strong O—H...O hydrogen bonds link the mol­ecules into inversion dimers. Weak C—H...O inter­actions extend the hydrogen-bonding network into three dimensions.

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The title compound, C21H24O9, crystallizes with two independent mol­ecules in the asymmetric unit which are almost centrosymmetrically related to each other. The ethano­ate group in one of the two mol­ecules is disordered over two positions with a site-occupation factor of 0.880 (7) for the major occupied site. In the crystal, the 1,3-diketone group exists in the keto–enol isomeric form due to the stabilizing effect of the intra­molecular O—H...O hydrogen bond present in this form. The compound packs as a layered structure in which C—H...π and C—H...O inter­actions are present within and between the layers.

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The title indole derivative, C17H15NO3S, crystallizes with two independent mol­ecules in the asymmetric unit. The benzene ring of the tosyl group is almost perpedicular to the indole ring in both mol­ecules, with inter­planar angles of 82.60 (5)° and 81.82 (6)°. The two mol­ecules are, as a consequence, able to form an almost centrosymmetric non-bonded dimer, in which the molecules are linked by pairs of C—H...π inter­actions. The crystal structure displays a three-dimensional network of C—H...O inter­actions. A π–π inter­action occurs between inversion-related indole rings with a centroid–centroid distance of 3.6774 (16) Å and an inter­planar angle of 1.53 (15)°. This inter­action leads to a stacking of mol­ecules along the a axis.
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